Hand brake



S. W. JOHNSON ET-AL Nov. 24, 1925. 1,562,967

HAND BRAKE Filed June ll, 1925 Sheets-Sheet l /L\ 7' v u Nov. 24, 1925- S. W. JOHNSON ET AL HAND BRAKE ELed une 1l, 1925 2 Sheets-Sheet lli lil

atented litblrllllif/D WlIlLHlliiLhll JHFSUN, F lldJINNJEMULIS, AND MHFNJESOTA.

nenn 'nnann application newline n, niet. sei-iai nassen.

To all 'whom t may concern:

Be itlrnown that we, Sienna WILHELM- Jonwson and .innnnw Ross, citizens ofthe lilnited States,residing at' Minneapolis and St. Paul, respectively, in the counties of Hennepin and Ramsey and tate of Minnesota,

have invented certain new and useful Improvements in Hand Brakes; and we do hereby declare'the 'following to bea full, clear, and eXact descri tion of the invention,

such as .will enable ot ers skilled in the artto which it appertains to makefand use the same. 4

Our 'invention relates to improvements, in a hand brake intended for use on allkinds 'vof cars, and has for certain ofiits objects dfi the setting of the brake at 'any desired tension.

'lo the above end, generally stated, the invention consists of the novel devices 'and combinations of devices hereinafter' described and defined in the claims. y

,1n the/accompanying drawings, which illustrate ther invention, like characters indicate. like parts throughout thev Iseveral views: l

Referring to the drawings: Fig. 1 is a fragmentaryelevation of the improved hand brake, some parts indicated:

by broken lines, and other parts indicated in different lines; v l Fig. 2 is atop view of the parts shown in Fig. 1; L

Fig. 3 is a detail view principally in horizontal section, taken on theline 3--3 of Fig. 1; and y Fig. 4: is a detail view principally in vertical section taken on the line ll-11' of Fig. 2.

'llhe numeral 5 indicates a' standard brake staff, and the numeral 6 indicates a brake chain secured by a bolt l to the drum-like body or other member of a car 10. f

positions bymeans of broken yinitial slack therein.

nnnnnw ness, or ar. rant,

lower `portion of said stadon which said r chain may be wound by rotating the brake stad' 5 during the brake-setting action. rlhe lower end of the brake staff 5 rests on the lower -portion of a bearing-bracket 8 and has' a depending reduced trunnion 9 journaled in a lbore-like seat-'in said bracket. 'lhe upper 'end of the drum-like Vstad 5 is This bearing bracket is secured to what may be assumed to be the The upper end ofl thembrake stad is journaled in a bearing lug 11 on an anchor- 'plate' 12v bolted tothe car 10. Formed withthe upper end of the brake staffV 5 is areduced screw-threaded stud 1?).v r1`he` upperf journaled in the upperv portion of the beari ying bracket 8.

end of the brake stad 5 terminates at the lipper face of the bearing lug 11, and the studI 13 extends thereabove and has applied thereto a hexagon nut 14, the flat sides of whichv afford stop, shoulders for a purpose which will presently appear. 14 has a reduced depending cylindrical portion 15 which impinges againstthe upper'- end of the brake staff 5. and has applied thereto a swivel 16 in the'yform of a collar .having a bifurcated bearing lug 17 to which.

a hand crank 18 is ivoted for vertical swlnging movement romp a posltlon 1n This hexagon nutV I sovv which it. stands radially outward from the brake stad 5 to a lposition in whichit eX- tends radially inward over the hexagon nut 1d, as indicated by= broken lines in Figfl.

rllhe inner end of the hand crank 18, which is relatively wide, extends inward of' its pivotal' connectionA with the swivel 16 for engagement with any one of the sides of the hexagon nut 111 to lock the swivel 16 and hence said hand crank for commonrotation with the brake stalfy 5, as indicated by full lines in Fig 1. The engagement of the handcrank 18 with the hexagon nut 1f forms l a stop to limit the downward swinging movement of saidhand crank and holds the same in an operative'position. The purpose of this hand crank 18 is to rotate the brake 'stad' 5, when the worm 20 is out of mesh with the worm gear 19, and wind the brake chain t3 thereon to take up the Normally, the hand crank 18 isturnedover theheragonnut 1t, as indicated by brokenflines in Fig. 1,

which disconnects the same from the hier.n agen nut 1t and permits free rotation of bearing lug 11, is a. Worm gear 19 with which v zineshes a worin 20 keyed` to the inner end i portion of a 'short shaft 2l, journaled in the prongsffotI an fupstanding vbiturcated vcrank 22.- ,The Vvorm 2O is mounted between the vprcings'oitthe crank 22 and is held thereby @against axial-movement. 4Said crank 22 at its lower endris ypivoted onl a headed shoulde're'd stud 23 seeuredto the anchor plate 12 terposed between thefanchor plate 12andY by vscrevf-threaded' engagement.4 A spacing `collar24 is mounted'on the stud 23 and incrank 22. vThe crank 22 isheld between the head of the pivotstud23 and spacingcollar 24 xvith .'such 'freedom fas tto permit tree swinging movement] of 'fthe crank Formed with thefinn'er prong ofthe crank at the free' end-'thereofis a lug 25u which engages .the anchor plate 12 as a thrust bearing tov tjakerthe strain from the pivot stud 2d' during the brakefsetting ,action and while th'elbrakes are set.v Keyed to the' outer end of the shattfl is avhand Wheel 26 by which the 4shaft 2l may be operatedVV to rotate the brake statt 'through the -Worm 2() and .worm gearfl9v Integrally formed with the piv- Joted end of the crank22, in bell crank Aarrangement. therewith, is a ihandf lever 27 which extends radially away from the brake (fea/r 19.

staff 5101? operating said crank to carry the worm into and out of mesh with the-xvorm To lock the hand/,crank 27 with the Worm 2O either in`mesh or,ou t of mesh with the "Worm gear 19, We provide a latch comprising a lever 28 anda thrust bolt 29 to which it is connected by ajoint 30. This thrust bolt 29 is arranged to enter eitherone of a pair of circumerentially Ispaced bore-like seats 31 ina latch lug 32 integrally formed-Withthe anchor plate 12. The latchL lever 28 isintermcdiately ulcrumed 'to a bifurcated bear! ing lug 33 integrally formed with the hand lever 2T. The thrust bolt29 is mounted in a transverse seat Sel Whichextends completely through the hand lever 27. Al coiled spring 35, interposed between the latch lever 28 and the hand lever 27, is under strain to project the thrust bolt 29' into either of the seats 31 when brought into alignment therewith. A stop linger 3G on the lower end of thelatch lug 32 limits the downward movement of the operating lever 27 and positions the thrust bolt'29 for entrance inthe lower seat 31 to lock the operating lever 27 with the Worm V2.0 out of mesh with the Worm gear 19.

j In actual usage, a casing substantially the i same size as the anchor plate 12 will beprovided to cover all of the parts thereon and `with only a slot therein for the hand lever 27 to permit the required movement to carry `and hence prevents spinning rteaeer l r 'the hom; 2o iemand'. out' er mesh with the tation of'the'swivel lt'fvvith the hand crank 1 8 Working abov'esaid casing. f y Operation.

When the brakes are set, the hand .crank 18 will be in an inoperative position, as shovvn by broken'lines in Fig. 1, so that the swivel 16 -is loose in respect tothe brake stattl` Obviously,-the hand Wheel 26`is in a convenient position for an y.operator so that the brakes can be set with comparatively little eliiort. rthe Worm 20 and Worm gear 19 Vpermit any desired tension to be placed on the brake'chainv G which is not possible with the hand brakes inwhich pawl and ratchet de- 'viees are used forthereason that the brake staff must always be. moved a predetermined distance to permit the pawl to engage one ot the teeth of the ratchet Wheel. the worm .20/and Worm gear 19 automatically and positively lock the brake staff 5 against 'backward rotation under the tension ot the brake chain G thereon, and there is no danger whatsoever inthe accidental release of the brake staff 5 by a movement otthe Worm 20 vout ot mesh with the Worm gear 19. Vhen Furthermore,

prong' o l"A a biturcated crank 22 thus relieving all strain on the pivotal support of said crank.

, To release the brakes, it is only necessary for the operator to take hold of the hand lever27, together With the lateh'lever 28, and press said latchlever against the tension of the spring 35 to withdraw the thrust bolt 29 from the upper bolt seat' 31,' and then swing the hand lever 2T downward against the stop 3G to move the Worin-20 out ot' mesh with lthe Worm gear 19, release the brake statt' 5 and permit the same to be freely rotated under the tension of the brake chain 6 as Jhe same unwinds therefrom. At the time `the hand lever 27 engages the stopSG, the

.during the brake releasing action. Then the operator 1s releasing the brakes, he has a good hold on the hand lever 2T and may also hold onto the hand wheel 26 so that there is no danger of him being thrown from his position or in any Way injured by the moving parts of the brake releasing mechanism. At the time the thrust bolt 29 is lll() Withdrawn from the upper y seat. 3 1, `*the `and swing the crank intoapositioIi-to carry 45 outwardpressure of .the'egwormgear 19 on the Worm'20'ass1sts 1n movl/ng said` Worm l outofmesh Withthe Worm ygear.

i -v 'into'an, inoperative position so that the saine '.To take up the initial slack in the brake chain 6 after the brake has beenreleased, ,the hand crank 18 may be turned'into an operative position, as indicated by fullb lines in. Fig. 1, to causethc inner '.end thereof to eng-age one of the Hat sides ofqthe heXaf gon nut let'and thereby lock'the swivel 16 tor commonotation with the brake sta 5. j The brake staff 5 can then be rotated b ,l the hand crank 18. VVhen'this initial slac i into mesh .With'the Worm gear119 and'thereby'lockl the brake staff" against a movement to permit the brake chain to unwind' there from.: The handfcrank v18 is then turned will, not Spin at the time the brake 'staff '5 r is2 released ybyithemovementot the Worm out of-m'esh with the Worm gear i19. In some instances, this hand crank 1.8 maybe dispensed'with and the initialv slack taken up in 'the brake chain 6 by operating the vhama whence,

To move a car, when `thx-:fbrakcs areset, to reposition the same, v1t 1s only necessary .to turnthe hand wheel 26 backward to re .L lIn a hand brake, a brake stafiequpped "'with a' .Worm gear, *aj crank mounte lease the brake chain4 6, VBy thus releasing What Werclaim is for free 'swinging movement in a vertical plane,

a Worm journaled on the crank and adapted to mesh with the worm' gear, a hand i lever ldirectly attached to' the crank, ar

ranged to dropunderthe action of gravity worm, in mesh Y'with the, Worm gear, andl lmf'aans' y for operatingzthe worm. l

2; Ina hand brake, abrake staff tequipped 'Q With aWorm gea`r,-a crank-,a Worm mounted `on the crankmea1is vfor moving-the crank tog carry the Worm into and. vout'of mesh .with the Worm f gear, means for operating theworm, yand a hand crank'applied to the brake4 staff vvfor turning the -same 4When the @worm is out cf mesh with the Worm gear,

3'. TheV structure defined 1in claim 2,.'i1'1 j g which Ithe-hand cran-k is'pivotally appliedtothe brake staff.' y

Y 4. In a hand brake, 4a brake stall equipped Withy a Worm gear, a crank, a Worm mounted' on the crank, means for moving thecrank to carry the worm into' 4and out of mesh with, the Worm .gear,lumeans for operating the worm, aswivel onythe brake staff, and v a hand crankpivoted to-thefszwivel and ar- `ra'nfged to engage afshoulder on the brake'v when in an o erative, position-to --lock the 4swivel `to the sta rotation therewitln Y' rake staff for common" 5J lIn a hand brake, a brake; staffl equipped i -vv'thA a Wormgear, a crank, a worm mounted on the crank, means.- for moving-the crank V toicarry the worm-into. and .outflof `mesh .with the Worm gear, meansforop'erating the Worm, a :shouldered nut applied to the brake 's taif and having a 'cylindrical body portion,.a swivel on the cyli'ndriiml.body' 'i 8D 1 oted totheswi'vel` and adapted in one of itsvpositions -to engage-the lshouldered nut portion of thenut, anda l1and'crank piv- 'and lock the swivel-to the brake staff for commonrotation,therewith, .i l In testimony whereofjwe aix o ur sig- ANDREW ROSS.y 

